HtDF Lab, Problem PROBLEM: Design a function called nth-char-equal? that consumes two strings than n and have the same character at position n. ;;and a natural and produces true if the strings both have length greater Note, the signature for such a function is: ;(@signature String String Natural -Boolean) The tag and template for such a function are: (@template String) ;;(define (nth-char-equal? s1 s2 n) ;: (... s1 s2 n))